Crypto mechanics in ios8 and android L

http://blog.cryptographyengineering.com/2014/10/why-cant-apple-decrypt-your-... http://nelenkov.blogspot.com/2014/10/revisiting-android-disk-encryption.html That's the frontdoor. Baseband's still present and wide open. Thus consider a non-cell device (a pad/laptop) tethered to cell hotspot or another phone to provide mobile wifi voice/data (IP) to the device. Is connecting to a cell hotspot or another phone to use the native cell voice/data (cell) of the cell network even possible? ie: You can drive a phone's sms over it's usb port. But that's just sms, not cell voice or cell IP.